Gvrp; Protocols And Standards - HP A6600 Configuration Manual

Field
Attribute length
Attribute event
Attribute value
The destination MAC addresses of GARP messages are multicast MAC addresses, and vary with GARP
applications. For example, the destination MAC address of GVRP is 01-80-C2-00-00-21.

GVRP

GVRP overview
As a GARP application, GVRP uses the operating mechanism of GARP to maintain and propagate
dynamic VLAN registrations throughout a switched LAN.
In a switched LAN, each GVRP-enabled switch sends and receives VLAN declarations and withdrawals
from other GVRP-enabled switches, and dynamically updates its local database about active VLAN
members and through which port each VLAN member can be reached. GVRP ensures that all
GVRP-enabled switches in a LAN maintain the same VLAN information.
The VLAN information propagated by GVRP includes not only manually configured static VLAN
information but also dynamic VLAN information from other switches.
GVRP registration modes
GVRP is available on trunk ports. It provides the following registration modes:
• Normal mode – Performs dynamic VLAN registrations and deregistrations on the trunk port, and
sends declarations and withdrawals for dynamic and static VLANs. VLANs manually configured are
called static VLANs, and VLANs created by GVRP are called dynamic VLANs.
Fixed mode – Disables the trunk port to register or withdraw dynamic VLAN information, but allows
•
the port to send declarations for static VLANs. A trunk port in this mode carries only static VLANs,
even if it has been assigned to all VLANs.
• Forbidden mode – Disables the trunk port to register or withdraw dynamic VLAN information, and
allows the port to send declarations only for VLAN 1. A trunk port in this mode carries only VLAN 1
even if it has been assigned to any other VLANs.

Protocols and standards

IEEE 802.1Q, Virtual Bridged Local Area Networks
•
Description
Length of an attribute, inclusive of
the attribute length field
Event described by the attribute
Attribute value
134
Value
2 to 255 (in bytes)
•
0x00: LeaveAll event
•
0x01: JoinEmpty event
•
0x02: JoinIn event
•
0x03: LeaveEmpty event
•
0x04: LeaveIn event
•
0x05: Empty event
VLAN ID for GVRP
If the value of the Attribute event
field is 0x00 (LeaveAll event),
the Attribute value field is
invalid.